Electrical ignition system for internal-combustion engines.



G. HONOLD. ELECTRICAL IGNITION SYSTEM FOR INTERNAL COMBUSTION ENGINES.

APPLIGATION rum) 00127, 1910.

1,063,542. Patented June 3, 1913. WW 11 s v Fgi.

MmlE-ssEs Q WNENTEIR aol-f/ab HMO/d ZM Z mv GOTTLOB HONOLD, orsru'r'reanr, GERMANY, assIouon BOSCH, or STUTTGAB'T, GEBMAN TO THE mm orwarm ELECTRICAL IGNITION SYSTEM FOR INTERIIAL-QOMBUSTION ENGIIiTES.

To all-whom it may concern Be it known that I, Go'rrLon HONOLD, a.subject of the Emperor of Germany, resid ing at Nos. 11-13Hoppenlaustrasse, Stut-t-; gart, Germany, have invented certain new; anduseful Improvements in Electrical Ignition Systems forInternal-Combustion Engines; and I do hereby declare the'following to bea full, clear, and exact description of the invention, such as willenable others skilled in the art to which it appertains to make and usethe same.

The invention relates to ignition in internal combustion engines bymeans of a battery, a transformer, a mechanical inter- 5 rupter, and anelectromagnetic spark plug.

It has heretofore been proposed .in such? systems to produce an ignitionspark by connecting an induction coil in electrical series with abattery and a mechanical interrupter, and connecting anelectromag' neticspark plug in parallel with the interrupter. At the desired moment ofignition, the interrupter is opened and the battery current added to theinduced current from the induction coil flows through theelectromagnetic spark plug, whose contact points are drawn apart inconsequence thereof and produce a spark. This system has been usedbecause of its simplicity and reliability. However, it requires arelatively high battery voltage, and furthermore, in order that theinduction coil shall have sufiicient self induction to generate a highvoltage, its winding must have many turns, in consequence of which arelatively high resistance is introduced in the battery circuit. Thissystem is not very well adapted for automobile engines, for the reasonthat in order to keep the weight as low as possible it is customary toemploy a battery of no more than four to six volts, and, at this lowvoltage, it is difiicult to obtain an induction coil of sufficientmagnetism within the desired dimensions, because in order to bring aboutsatisfactory ignition a sufiicient number of magnetizing ampere turns isrequired in the induction coil, and at the low voltage specified thisnecessitates a number of turns of wire of comparatively large crosssection.

The invention consists in substituting a transformer for the inductioncoil and connecting the battery in the primary circuit of thetransformer and the electromagnetic spark plug in the secondary circuit.

Specification 0! Letters Patent.

Application filed October air, 1010. Serial No. mam.

plifications of the system, in its duced thereby In the accompanyindrawin formin a part of this specificaiion, Fi fies 1 to i showdiagrammatically four di erent exemapplication, for instance, to singlecylinder engines.

It w1ll, of course, be understood that by using a distributer, anydesired number of spark plugs may be supplied from the system. n all ofthe figures, B is the battery, E the engine body, U the mechanicalinterrupter actuated from the engine shaft, P the primary winding of thetransformer, S the secondary winding of the transformer, and K theelectromagnetic spark plug including the winding and the sparklngelectrodes thereof.

The systems illustrated differ from each other in the arrangement of theprimary Winding, the battery and the mechanical interrupter, which arein all cases connected in series in the primary circuit. severalmodifications shown in the figures, one terminal of the secondarywinding is electrically connected to one terminal of the primarywinding. However this connection is not necessary as the ignition isequally well obtained with the secondary Winding disconnected from theprimary winding.

During the period of ignition the mechanical lnterrupter U is open. InFig. l the secondary winding is then in series with the battery and thespark plug. In Fig. 2 the secondary wlndin is then in series with theprlmary win ing and the spark plug. In Fig. 3 the secondary winding isthen in series with the spark the secondary winding is then in serieswith the primary winding, the battery and the spar plug.

The operation of the system Will now be describe Upon closing of theinterrupter the battery current flows to the primary winding P and themagnetization of the transformer proincreases rapidly to a high value,because the resistance of the primary winding is relatively low onaccount of its few turns of large wire. Therefore, when the interruptionoccurs, the full output of the battery is available for producing theignition spark and its voltage is raised to a sufficiently high value asa result of the ratio of transformation of the primary and sec ondarywindings. The winding of the electromagnetic spark plug is energized andI Patented June 3, 1913.

In the ignition spark. In this way on separating, produce the a batteryof comparatively low voltage produces a spark-- ing voltage ofsufficient lntensit-y to generate the ignition spark. v

Having thus described my invention, what I claim is:

the spark points,

1. In an ignition system for internal com bust-ion engines, atransformer, a battery and a mechanical interrupter in electrical seriesin the primary circuit of the transformer, and the winding of anelectromagnetic spark plug in the secondary circuit of the transformer;substantially as described.

2. In an ignition system for internal combustion en mes, a transformerhavin one terminal 0% its primary winding electrically connected to" oneterminal of its secondary winding, a battery and a mechanicalinterrupter 1n electricalseries in the circuit of the primary. winding,and the winding of an electromagnetic spark plug the circuit of thesecondary winding; substantially as described. v y

3. In an ignition system for internal combustion engines, abatterycommon to two electrical circuits, the primary winding of atransformer and a mechanical interrupter in one of said circuits, andthe secondary winding of the transformer and the winding of anelectromagnetic spark plug in the other of said circuits; substantiallyas described.

4. In an ignition system for internal combustion en nes, a battery andthe primary winding 0 a transformer common to two electrical circuits amechanical interru ter in one of sald circuits, and the secon ar windingof the transformer and the win ing of an electromagnetic spark lug inthe other of said circuits; substantially as described.

5. In an ignition system for internal combustion engines, a transformerhaving a GOTTLOB HONOLD. Witnesses:

MAX ANsoHU'rz, REINHOLD ELWERT.

